Dear PyMol users!

I want to prepare my pdb structure for MD simulation with gromacs

1- I want to place some CAP groups like ACE or NH2 to N and C termii of 1 and last residue of my protein, respectyally.

I found possible option for this in the build- amono acids
buit creted via this way ACE or NH2 groups were placed in the same label w\o links to specified atoms ( e.g I've selected C atom from 1 residue and tried to build ACE on this place)

So how I could merge new groups with existing atoms of the specified residues in desired location?

2- I want to orient my protein along desired axis. How it could be done?